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Method of providing an estimate of a location

  • US 6,646,603 B2
  • Filed: 06/15/2001
  • Issued: 11/11/2003
  • Est. Priority Date: 06/16/2000
  • Status: Expired due to Term
First Claim
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1. A method of providing an estimate of the location of first and second devices which are located near each other and are thus essentially at the same location , the method comprising the steps of:

  • obtaining at least one range measurement from the first device to a first reference point and location information with regard to the first reference point;

    obtaining at least one range measurement from the second device to a second reference point and location information with regard to the second reference point;

    resolving clock errors of the first and second devices; and

    calculating an estimate of the location of the devices using both of the range measurements obtained with respect to the first and second devices, wherein at least one range measurement obtained from the second device was obtained with respect to a reference point from which no range measurements were obtained from the first device.

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